Flight number record

AS 339

Alaska Airlines · Austin to Seattle

Route: AUS → SEA
Departs: 19:30
Flights: 287
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 339, check with Alaska Airlines.

AS 339 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land roughly 55 minutes behind schedule. That rests on 287 flights, with a median arrival 3 minutes early.

The national on-time rate over the same period is 77.6%, so AS 339 runs 5 points behind the country as a whole. Across a thousand flights that is about 51 extra late arrivals.

On time

72.5%

Arrivals under 15 minutes late, of 284 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

1.05%

National rate is 1.81%

1 hour+ late

8.1%

National rate is 8.1%

These figures cover 287 flights between July 2025 and June 2026. Beyond the headline rate, 8.1% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When AS 339 flies

AS 339 flies AUS to SEA without a single fixed slot. Its most common scheduled departure was 19:30, used on 48 of 287 flights, with 19:04 (46 flights) and 19:00 (33 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:3048 flights16.7%
Departs 19:0446 flights16.0%
Departs 19:0033 flights11.5%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 19:30 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and AS 339 runs 4 points better at 72.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

AS 339 next to AUS to SEA

Every carrier on AUS to SEA combined arrived on time 82.8% of the time across 2,058 flights, so AS 339 is 10 points behind it. Alaska flew 1,096 flights on the same city pair under all its flight numbers, including this one, and those ran 82.0% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight trails by 7 points.

AS 339 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 339thin sample	287	72.5%	54 min	1.05%	C
All Alaska Airlines on AUS–SEA	1,096	82.0%	55 min	1.00%	B
All carriers on AUS–SEA	2,058	82.8%	69 min	1.07%	B
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 339 quarter by quarter

AS 339 did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.7% on time and its weakest Jul–Sep 2025 at 59.7%, a swing of 26 points on roughly 72 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Jul–Sep 202578 flights59.7%
Oct–Dec 202583 flights75.6%
Jan–Mar 202669 flights72.5%
Apr–Jun 202657 flights85.7%

Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, AS 339 ranged from 66.0% on Sunday to 76.6% on Monday. With about 41 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why AS 339 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 60% of the 4,207 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
60%
National Airspace System
31%
Carrier
5%
Extreme weather
2%
Security
1%

60% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,207 reported delay minutes here, that single category outweighs weather by 33 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,207 delay minutes reported on AS 339.

Cancellations sit at 1.05% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

8.1% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 55 minutes, which a normal layover absorbs.

At 1,770 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

The same number turns up on one other city pair in the data, including SJC to HNL (27), but none flew often enough under AS 339 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to AUS to SEA only.

One caution: this is a thin sample. 287 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

What to do with this

Booking AS 339

For a booking, AS 339 is one of the weaker ways to fly AUS to SEA: 10 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

Where to go next

A flight number here means Alaska Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures